Arsenal suffered their second consecutive defeat in the ongoing Champions League as Olympiacos clinched a 3-2 triumph over the former at Emirates Stadium on Tuesday.
Winger Felipe Pardo put his side ahead in the 33rd minute, but Arsenal forward Theo Walcott equalized the score just two minutes later, Sport24 reported.
Arsenal's David Ospina dropped Kostas Fortounis's corner into his own net to extend Olympiacos' lead in the 40th minute.
Arsene Wenger side dragged back into it with a second half equalizer by Alexis Sanchez, but the Greek side claimed victory when Alfred Finnbogason smacked the match-winning goal.
Arsenal will next lock horns against Bayern Munich, who have also claimed an easy 5-0 win over Dinamo Zagreb in their Champions League clash .